I'm (sean_parent) currently working only XCode from the XCode projects. The Begin test app can currently be build with XCode 4.5.2.

To setup a build:

1. clone the legacy repository and switch to the development branch
2. download boost 1.52.0 from boost.org
3. create a symlink to your boost directory inside the legacy directory (here is the command from my worksheet):
ln -s ~/development/third_party/boost_1_52_0 ~/development/github/stlab/legacy/boost_libraries
4. Open the project at adobe_platform_libraries/xcode_ide/begin.xcodproj
5. Select the begin scheme and run.